Bug fix, IRC report.

With 2 windows, 2 scenes, linked objects:
- enter editmode in 1 window.
- the other window allowed to enter editmode too.
- and crash happened on exit editmode.

Since editmode is in Context (scene->obedit) a bad conflict arises.

New function BKE_object_is_in_editmode() returns this info outside of
context. Note I didn't use BMEdit_FromObject() because of the assert().

NOTE: contextual storage of editmode could need rework... five places:
- ob->mode / ob->restore_mode
- scene->object
- CTX_data_edit_object()
- BKE_object_is_in_editmode()
- view3d mode handling menu

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/editors/object/object_edit.c b/source/blender/editors/object/object_edit.c
index d39e34824b9..12edb3e8edb 100644
--- a/source/blender/editors/object/object_edit.c
+++ b/source/blender/editors/object/object_edit.c
@@ -429,6 +429,10 @@ void ED_object_enter_editmode(bContext *C, int flag)
 
 	ob = base->object;
 
+	/* this checks actual object->data, for cases when other scenes have it in editmode context */
+	if ( BKE_object_is_in_editmode(ob) )
+		return;
+	
 	if (BKE_object_obdata_is_libdata(ob)) {
 		error_libdata();
 		return;